重置用于有效渲染粒子系统的保留图形内存的缓存。
为了有效地将其数据写入图形内存，粒子系统使用一个预先分配的顶点缓冲池。渲染大量粒子时，该池的大小会增加，然后即使之后渲染较少的粒子也能保持该大小。
在渲染大量粒子的情况下，维持大型池可以使将来的渲染更有效，并且已经对该池进行相应预调整。但是，大型池使用的内存更多，因此该函数允许释放该内存。
您知道已完成大量粒子渲染时，此方法最有用，并且在不久的将来（即从包含大量粒子的场景过渡到渲染较少粒子的场景时），无需渲染相似数量的粒子。
现代图形 API（如 DirectX12、Vulkan 和 Metal）不会使用预分配的顶点缓冲区池，因为它们可以在没有该池的情况下有效地运行。该方法对这些设备没有任何作用。
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